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Even though strnlen(3) is required by POSIX 2008,
Matthias Scheler reports than Solaris 10 lacks it.
While here, sort the declarations in config.h
and move the headers to the top.

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef HAVE_STRNLEN

int dummy;

#else

/*	($)OpenBSD: strnlen.c,v 1.4 2012/04/26 01:22:31 matthew Exp $	*/

/*
 * Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <string.h>

size_t
strnlen(const char *str, size_t maxlen)
{
	const char *cp;

	for (cp = str; maxlen != 0 && *cp != '\0'; cp++, maxlen--)
		;

	return (size_t)(cp - str);
}

#endif